Improvement in electro-magnetic dental engines



E. R. PETJII'I'. ELECTROMAGNETIC DENTAL-ENGINE. No.173,864. PatentedFeb. 22, 1876.

vnnmssas: WM

N. PETERS, PHOTOLITHOGRAPHER, WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

ELIHU R. PETIIT, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN ELECTRO-M AGNETIC DENTAL- ENGINES.

Specification forming part of Letters Patent No. 173,864, dated February22, 1876; application filed January22, 1876.

To all whom it may concern Be it known that I, ELIEIU ROBERTS PETIIT, ofPhiladelphia, in the county of Philadelphia and State of Pennsylvania,have invented a new and Improved Armature and Magnetic Engine Attachmentto Dental Engines, of which the following is a specifica tion:

My invention consists of a simple contrivance for coupling a magneticengine to a dental engine, for use instead ofthe footpower for drivingit, using the armaturewheel of the magnetic engine in the place of thedriving-wheel of the foot-power for running the band, and mounting thestandard of the dental engine on the shaft of the armature for itssupport.

Figure l is a side elevation of my improved magnetic and dental enginecontrivance, and Fig. 2 is a front elevation.

Similar letters of reference indicate corresponding parts.

A is the crotched standard of the dental engine, which I cut in two 'ustbelow the bearings B, for the shaft 0 the driving-pulley, which isworked by the foot-trcadle, and fits on a shaft, (J, which I mount inbearings D of standards E, which I secure to the projecting ends of thearmature-shaft F, with extensions G to the base, or nearly, connectingwith spring H, or any other suitable contrivance to keep the standardupright, but at the same time allowing it to vibrate for swinging thetop forward and backward, as may sometimes be required in themanipulation of the tools. This brings the shaft-pulley I directly overthe armature-wheel J, so that it may serve for the band-wheel, for whichI make V notches'in the armature for a round band, K, and flat bottomednotches for a flat band.

In making new machines for connection with a magnetic engine, the crotchL of the standardvwill be extended so as to serve for the standards E,and lit the bearings D on the' armature-shaft, thus dispensing with theshaft 0, which is only necessary in theconnection of dental engines madefor foot-power.

Having thus described my invention, I claim as new and desire to secureby Letters Patent l. The combination ofa magnetic engine with thestandard of a dental engine, in the manner described, whereby thearmature-wheel of the magnetic engine lines with the pulley of thedental engine, and at the same time the armature-shaft serves for thesupport of the dental engine standard, substantially as specitied.

2. Also, the armature-wheel of a magnetic engine, provided with aband-groove to utilize it for driving by a band running on it,

substantially as specified.

ELIHU R. PETTIT. Witnesses:

ALLAN W. RICHARDS, L. BASIET.

